/// <summary>
/// Advance index past variant, and accumulate normalized variant in buffer. This ignores
/// the codepage information from POSIX ids. Index must be immediately after the country
/// or script. Index is left at the keyword separator or at the end of the text. Return
/// the start of the variant code in the buffer.
/// </summary>
/// <remarks>
/// In standard form, we can have the following forms:
/// <list type="bullet">
/// <item><description>ll__VVVV</description></item>
/// <item><description>ll_CC_VVVV</description></item>
/// <item><description>ll_Ssss_VVVV</description></item>
/// <item><description>ll_Ssss_CC_VVVV</description></item>
/// </list>
/// <para/>
/// This also handles POSIX ids, which can have the following forms (pppp is code page id):
/// <list type="bullet">
/// <item><description>ll_CC.pppp --> ll_CC</description></item>
/// <item><description>ll_CC.pppp@VVVV --> ll_CC_VVVV</description></item>
/// <item><description>ll_CC@VVVV --> ll_CC_VVVV</description></item>
/// </list>
/// <para/>
/// We identify this use of '@' in POSIX ids by looking for an '=' following
/// the '@'. If there is one, we consider '@' to start a keyword list, instead of
/// being part of a POSIX id.
/// <para/>
/// Note: since it was decided that we want an option to not handle POSIX ids, this
/// becomes a bit more complex.
/// </remarks>
private int ParseVariant()
{
int oldBlen = buffer.Length;
bool start = true;
bool needSeparator = true;
bool skipping = false;
char c;
bool firstPass = true;
while ((c = Next()) != DONE)
{
if (c == DOT)
{
start = false;
skipping = true;
}
else if (c == KEYWORD_SEPARATOR)
{
if (HaveKeywordAssign())
{
break;
}
skipping = false;
start = false;
needSeparator = true; // add another underscore if we have more text
}
else if (start)
{
start = false;
if (c != UNDERSCORE && c != HYPHEN)
{
index--;
}
}
else if (!skipping)
{
if (needSeparator)
{
needSeparator = false;
if (firstPass && !hadCountry)
{ // no country, we'll need two
AddSeparator();
++oldBlen; // for sure
}
AddSeparator();
if (firstPass)
{ // only for the first separator
++oldBlen;
firstPass = false;
}
}
c = AsciiUtil.ToUpper(c);
if (c == HYPHEN || c == COMMA)
{
c = UNDERSCORE;
}
Append(c);
}
}
--index; // unget
return(oldBlen);
}
/// <summary>
/// Returns the value for the named keyword, or null if the keyword is not
/// present.
/// </summary>
public string GetKeywordValue(string keywordName)
{
var m = GetKeywordMap();
return(!m.Any() ? null : m.Get(AsciiUtil.ToLower(keywordName.Trim())));
}
/// <summary>
/// Returns the value for the named keyword, or null if the keyword is not
/// present.
/// </summary>
public string GetKeywordValue(string keywordName)
{
var m = GetKeywords();
return(m.Count == 0 ? null : m.Get(AsciiUtil.ToLower(keywordName.Trim())));
}
